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The third term is related to the slippage of nails fastening the sheathing to the top and bottom shear wall chords, i.e top and bottom wall plates.
Fastener Slip en - Wood Panels
The fastener slip en is taken from an equation in O86 A11.7. Note that the slip is non-linear with respect to shear-per-fastener Vn .
Fastener Slip en - Gypsum Wallboard and Other Non-wood-panel
Specified in O86 A.11.7. Note that it does not depend on v at all for other materials, in fact is a constant, 0.76 mm = .03".
Fastener Load Vn
The load per fastener Vn is calculated by dividing the shear-per-unit-length v by the user-input panel edge spacing, yielding the force on each edge fastener.
Shear Value v
Refer to Distribution to Sides of Composite Wall for an explanation of how shear is apportioned to each side of a composite wall.
Unseasoned Lumber
For unseasoned lumber, that is lumber with fabrication moisture content greater than 19%, the deflection values are doubled as per the in note A.11.7 Note 2.
Unblocked Walls
For unblocked walls, a nail spacing of 150mm is used in place of the actual nail spacing to comply with CSA O86 11.7.1.2.